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uCOS Port Dependent Functions
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// Start

    _startup
    
    Reset_vector
    Undef_vector
    SWI_vector
    PAbor_vector
    DAbort_vector
    IRQ_vector
    FIQ_vector


// Handlers

    ResetHandler
    UndefHandler
    SWIHandler
    PAbortHandler
    DAbortHandler
    IRQHandler
    FIQHandler

// Turn interrupts off
    
    CPU_SR_Save

// Turn interrupts back on

    CPU_SR_Restore

// Start highest priority ready task

    OSStartHighRdy

// Context Switch
    
    OSCtxSw

// Interrupt Context Switch

    OSIntCtxSw